| (19) |
 |
|
(11) |
EP 0 199 021 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
26.10.1988 Bulletin 1988/43 |
| (43) |
Date of publication A2: |
|
29.10.1986 Bulletin 1986/44 |
| (22) |
Date of filing: 27.02.1986 |
|
|
| (84) |
Designated Contracting States: |
|
DE FR GB IT LU |
| (30) |
Priority: |
18.04.1985 US 724692
|
| (71) |
Applicant: THE FIRESTONE TIRE & RUBBER COMPANY |
|
() |
|
| (72) |
Inventors: |
|
- Kay, Edward L.
()
- Roskos, Kenneth B.
()
|
|
| |
|
| (54) |
Nucleation of urethane compositions |
(57) Generally, urethane compositions free of phase separation patterns and flow lines
are produced. One method includes the utilization of a nucleating compound which is
generally added to a urethane prepolymer before any chain extension thereof. Another
method includes adding a very small initial incremental amount of a curing agent to
the prepolymer with an insoluble product being produced thereby and subsequently adding
the remainder of the curing agent.